Unlock Mitsubishi GX Works2 FB Password
Recover or remove a block password on a Function Block in a Mitsubishi GX Works2 project. "Block password" is Mitsubishi's own term for this protection, documented in the GX Works2 Operating Manual — and the same manual is blunt about the risk: if you forget it, you cannot open the program inside that FB, and you can't even save further changes to it until the password is removed. If you'd rather have it handled, I provide manual Mitsubishi recovery support — done personally, with nothing sold or downloaded from this site.
What this walkthrough covers
- GX Works2 block password / FB protection
- Recovering edit access to a locked Function Block
Supported software & hardware
- GX Works2 projects (block password / FB protection)
- MELSEC Q series, L series, FX3U, FX3UC, FX3G, FX3GC, FX3S controllers
Who this is for
- You forgot or lost the FB / block password on your own project
- A previous engineer left and no password record was kept
- You've inherited a legacy project you legally own and need to maintain
Locked out of a Mitsubishi project you own?
Send the software and version, and a short description of what you're locked out of. The work is manual and done personally — no tools sold, no downloads.
Email for recovery support More on YouTubeQuestions
Which products and versions does this cover?
It applies to GX Works2 projects (block password / FB protection), MELSEC Q series, L series, FX3U, FX3UC, FX3G, FX3GC, FX3S controllers.
Who does the recovery?
I do, personally. Every job is manual — it isn't automated with a tool and it isn't resold to anyone else.
Do I have to own the equipment?
Yes. I only help owners and authorized maintainers regain access to their own projects — in line with the authorized-use-only policy on the channel.
Do you sell a tool or a download for this?
No. There are no tools for sale and no downloads on this site. Recovery is a manual service I perform or guide you through.